textproduct: Quad Cities

KEY MESSAGES

- A passing cold front this morning will bring about cooler weather through the mid to late week, with increasing rain chances again Thursday night through Friday.

SHORT TERM /THROUGH TONIGHT/

Issued at 259 AM CDT Tue May 19 2026

Another squall line that generally washes out as it enters and moves acrs the local fcst area this morning, and will account for some lingering patches of post-system stratiform rain and isolated thunder through 9 AM or so. Also some chance for fields of wake low winds gushing out the backside of the decaying precip but appears less extensive than the last two mornings. Seasonably robust cold front lurks upstream acrs central into northeast IA ATTM, with RAP/CAM timing blend having it crossing the MS RVR from 15-16z this morning. Then the story will be blustery post-frontal northwest winds, a stratocu deck, and temps falling into or held well down in the 60s when normal highs for this time of year are generally in the low to mid 70s. Some spotty light showers or sprinkles may get wrung out of the stratocu cloud deck at times today, but overall mainly dry after this morning.

Tonight...Clearing and cooler with the arrival of a high pressure system acrs the upper MS RVR Valley. Low temps by Wed morning will look to range from the upper 40s in the southeast, to the low 40s northwest.

LONG TERM /WEDNESDAY THROUGH MONDAY/

Issued at 259 AM CDT Tue May 19 2026

Wednesday and Thursday...The ridge will look to maintain fair wx acrs the region for Wednesday with some sunshine but below normal temps with 60s during the day and 40s at night. Thursday not the warmest of days as well, with east to northeasterly boundary layer flow back from the ridge complex migrating eastward acrs the GRT LKS. The latest suite of ensembles and upper jet trends suggest longer wave troffiness to establish acrs the Rockies into the late week. As this upper trof tries to pivot northeastward with some moisture return looking to stream up off the western Gulf(but also signs of this feed getting interrupted to the south acrs the southeast plains over to the TN Valley), there may be increasing chance for some showers by late Thu or Thu night. A probable slow down with this process may then target more of a Friday into early Saturday window for precip chances.

Friday through Monday...If the above mentioned scenario occurs, Friday may be mostly cloudy and continued cool with shower chances extending into Friday night. A thunderstorm also possible during this timeframe but support for much of any severe threat does not appear to be there heading into the weekend. Some temperature moderation still looks to be on tap over the weekend back to normal or even a bit above normal by the end of the period. Trying to time another passing trof with the next precip chance uncertain at this point but a few favorable ensemble solutions suggest there could be a chance on Sunday.

AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/

Issued at 1250 AM CDT Tue May 19 2026

Another night of strong LLVL winds and a linear MCS moving through the TAF sites. After the main line pushes through, behind it more stratiform rain with some embedded thunder and patches of wake low wind fields gusting up to 40-50 KTs out of the backside of the departing precip shield. The main upstream cold front will slip through Tuesday morning from west-to-east with a sfc wind veer to the west and eventually northwest as Tuesday morning progresses. the northwest winds may gust 25-30 KTs. Along and post-frontal there is a substantial field of MVFR stratocu that will move acrs most of the area through evening, before some erosion and clearing occurs Tuesday evening.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.